1. A concise explanation of the problem you're experiencing.
I am new to Cesium and trying to show a sequence of positions in CZML , based on the hang-glider example.
The raw data I will be using is time-stamped using the ISO8601 format. When I try to play the data (in Sandcastle) using these absolute values as the time coordinate of the cartographicDegrees values, I get an error:
"Uncaught SyntaxError: Invalid or unexpected token (on line 49)"
Line 49 is the first line of the position data in my test case.
If I change the time coordinate to be relative to the start time/date, the code works fine.
The CZML Guide specifies that a CartographicValue can accept either an ISO8601 date/time or a duration in seconds since the epoch value.
2. A minimal code example. If you've found a bug, this helps us reproduce and repair it.
var czml = [{
"id" : "document",
"name" : "MRS-BCN Path",
"version" : "1.0",
"clock": {
"interval": "2018-05-07T20:30:56Z/2018-06-01T10:22:48Z",
"currentTime": "2018-05-07T20:30:56Z",
"multiplier": 10
}
}, {
"id" : "path",
"name" : "path with GPS data",
"description" : "<p>NCL Star test</p>",
"availability" : "2018-05-07T20:30:56Z/2018-06-01T10:22:48Z",
"path":{
"material":{
"solidColor":{
"color":{
"interval":"2018-05-07T20:30:56Z/2018-06-01T10:22:48Z",
"rgba":[
255,255,0,255
]
}
}
},
"width":[
{
"interval":"2018-05-07T20:30:56Z/2018-06-01T10:22:48Z",
"number":5.0
}
],
"show":[
{
"interval":"2018-05-07T20:30:56Z/2018-06-01T10:22:48Z",
"boolean":true
}
]
},
"billboard" : {
"image" : "data:image/png;base64,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",
"scale" : 1.5,
"eyeOffset": {
"cartesian": [ 0.0, 0.0, -10.0 ]
}
},
"position" : {
"cartographicDegrees" : [
2018-05-07T21:04:16Z,139.648293,35.453610,20,
2018-05-07T21:05:56Z,139.649021,35.454524,20,
2018-05-07T21:07:36Z,139.650428,35.455729,20,
2018-05-07T21:09:16Z,139.652651,35.456653,20,
2018-05-07T21:10:56Z,139.655581,35.457183,20,
2018-05-07T21:12:36Z,139.659321,35.457660,20,
2018-05-07T21:14:16Z,139.663773,35.457895,20,
2018-05-07T21:15:56Z,139.668401,35.456967,20,
2018-05-07T21:17:36Z,139.672952,35.455137,20,
2018-05-07T21:19:16Z,139.677324,35.453094,20,
2018-05-07T21:20:56Z,139.681235,35.451142,20,
2018-05-07T21:22:36Z,139.684845,35.449268,20,
2018-05-07T21:24:16Z,139.688653,35.447258,20,
2018-05-07T21:25:56Z,139.692887,35.444908,20,
2018-05-07T21:27:36Z,139.697270,35.442180,20,
2018-05-07T21:29:16Z,139.701788,35.439233,20,
2018-05-07T21:30:56Z,139.706206,35.435995,20,
2018-05-07T21:32:36Z,139.709653,35.431915,20,
2018-05-07T21:34:16Z,139.711990,35.426894,20,
2018-05-07T21:35:56Z,139.713776,35.421121,20,
2018-05-07T21:37:36Z,139.714842,35.414832,20,
2018-05-07T21:39:16Z,139.714716,35.408245,20,
2018-05-07T21:40:56Z,139.713451,35.401569,20,
2018-05-07T21:42:36Z,139.711316,35.394964,20,
2018-05-07T21:44:16Z,139.708643,35.388402,20,
2018-05-07T21:45:56Z,139.706176,35.381720,20,
2018-05-07T21:47:36Z,139.704681,35.374875,20,
2018-05-07T21:49:16Z,139.703862,35.367985,20,
2018-05-07T21:50:56Z,139.703624,35.361103,20,
2018-05-07T21:52:36Z,139.703799,35.354290,20,
2018-05-07T21:54:16Z,139.704620,35.347561,20
]
}
}];
var viewer = new Cesium.Viewer('cesiumContainer', {
terrainProvider : Cesium.createWorldTerrain(),
baseLayerPicker : false,
shouldAnimate : true
});
viewer.dataSources.add(Cesium.CzmlDataSource.load(czml)).then(function(ds) {
viewer.trackedEntity = ds.entities.getById('path');
});
3. Context. Why do you need to do this? We might know a better way to accomplish your goal.
I can't go into too much detail but this involves display the track of an object from a history of its movements.
4. The Cesium version you're using, your operating system and browser.
Locally-installed Cesium 1.45, Sandcastle. Windows 7, Chrome Version 67.0.3396.99 (Official Build) (64-bit)